<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../react18/react.development.js"></script>
    <script src="../react18/react-dom.development.js"></script>
    <script src="../react18/babel.min.js"></script>
</head>
<body>
    <div id="app"></div>
    <script type="text/babel">
     class App extends React.Component{
        state={
            isHot:true
        }
     render(){
        const {isHot}=this.state;
        return(
            <div>
                <button onClick={this.changeWeaHandle}>改变天气</button>
                {
                    isHot?
                    <div>
                    <h1>天气真热啊</h1>
                    <p>热的雪糕都化不了</p>    
                    </div>
                    :
                    <div>
                    <h1>天气真冷啊</h1>
                    <p>冷都穿袄子</p>    
                    </div>
                }
            </div>
        )
     }
        changeWeaHandle=()=>{
            const {isHot} = this.state;
            this.setState({isHot:!isHot})
        }
        }

        const root =ReactDOM.createRoot(document.getElementById('app'));
        root.render(<App/>)
    </script>
</body>
</html>